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Power handling capabilities of superconducting YBCO thin films: Thermally induced nonlinearity effects

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Abstract

We have measured the microwave power dependence of the surface impedance Zs of YBa2Cu3Ox thin films up to very high microwave power levels. Films with different crystal qualities, including one with a bicrystal Josephson junction, were investigated. The experiments included both frequency-domain and pulsed time-domain measurements using a 14 GHz TE011 dielectric cavity. Our results demonstrate that the dissipation of heat, generated by rf currents in the superconducting film, contributes to the observed nonlinearities in the surface resistance. The relative extent of this contribution is determined primarily by the film quality. A simple Fabry-Perot resonator model, combined with a cavity heat transfer model, was used to analyze the effects of such nonlinearities on the electromagnetic response of the dielectric cavity to a pulsed input signal.

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Authors and Affiliations

  1. Texas Center for Superconductivity and Department of Electrical and Computer Engineering, University of Houston, 77204, Houston, Texas

    Jaroslaw Wosik, Dawei Li & Stuart A. Long

  2. Texas Center for Superconductivity and Department of Physics, University of Houston, 77204, Houston, Texas

    Lei-Ming Xie & John H. Miller

  3. Institute of Physics, Polish Academy of Sciences, PL-02-668, Warsaw, Poland

    Krzysztof Nesteruk

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  1. Jaroslaw Wosik
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  2. Lei-Ming Xie
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  3. Krzysztof Nesteruk
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  4. Dawei Li
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  5. John H. Miller
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  6. Stuart A. Long
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Wosik, J., Xie, LM., Nesteruk, K. et al. Power handling capabilities of superconducting YBCO thin films: Thermally induced nonlinearity effects. J Supercond 10, 97–107 (1997). https://doi.org/10.1007/BF02763179

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  • DOI: https://doi.org/10.1007/BF02763179

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